Which of the following demonstrates the central dogma of molecular biologists?(1 point)

Question

Responses

Gene expression relies on environmental factors that determine which traits are dominant.
Gene expression relies on environmental factors that determine which traits are dominant.

Proteins replicate DNA which gives the expression of traits to an organism.
Proteins replicate DNA which gives the expression of traits to an organism.

DNA and RNA hold the code to create proteins that are the key to gene expression.
DNA and RNA hold the code to create proteins that are the key to gene expression.

DNA and RNA mutate into either harmful or helpful effects on the human body.

After the amino acid chain leaves the ribosome, which organelle then folds, modifies, and transports the protein?(1 point)
Responses

Endoplasmic Reticulum
Endoplasmic Reticulum

Ribosome
Ribosome

Cytoplasm
Cytoplasm

Lysosome

Look at the DNA sequence.

C G T T A C T G C A A T
G C A A T G A C G T T A
Which sequence shows a substitution mutation?

(1 point)
Responses

C G T G A C T G C A A T
G C A C T G A C G T T AC G T G A C T G C A A T G C A C T G A C G T T A

C G T C T A C T G C A A T
G C A G A T G A C G T T AC G T C T A C T G C A A T G C A G A T G A C G T T A

C G T T A C T G C A A T
G C A A T G A C G T T AC G T T A C T G C A A T G C A A T G A C G T T A

C G T A C T G C A A T
G C A T G A C G T T A

Which of the following best describes how a liver cell and skin cell have the exact same DNA sequence and yet look different and perform different functions?(1 point)
Responses

The cells mutate during transcription.
The cells mutate during transcription.

The tRNA uses a different sequence in each cell during transcription.
The tRNA uses a different sequence in each cell during transcription.

The cells discard the DNA that is not in use.
The cells discard the DNA that is not in use.

The proteins are expressed differently in each cell

Stella described protein synthesis as a process that makes the necessary proteins for the human body to function. She explained the process in the following steps.

DNA is transcribed into mRNA.
Amino acids form a chain.
The amino acid chain is folded into a protein in the endoplasmic reticulum.
What step did Stella miss in her explanation?

(1 point)
Responses

mRNA is translated into amino acids.
mRNA is translated into amino acids.

DNA is replicated into two daughter cells.
DNA is replicated into two daughter cells.

Polypeptide chains express gene traits.
Polypeptide chains express gene traits.

tRNA delivers the DNA to the ribosome.

please answer corecctly and dounle check

Answer 1

Sure! Here are the answers based on the principles of molecular biology:

1. Which of the following demonstrates the central dogma of molecular biology?

   • Answer: DNA and RNA hold the code to create proteins that are the key to gene expression.
     • This statement describes the flow of genetic information from DNA to RNA to protein, which encapsulates the central dogma.

2. After the amino acid chain leaves the ribosome, which organelle then folds, modifies, and transports the protein?

   • Answer: Endoplasmic Reticulum
     • The endoplasmic reticulum (specifically the rough ER) is responsible for folding and modifying proteins.

3. Which sequence shows a substitution mutation?

   • Answer: C G T A C T G C A A T
     • In this sequence, the original "C G T T A" has been changed to "C G T A." This indicates a substitution mutation as one nucleotide is replaced with another.

4. Which of the following best describes how a liver cell and skin cell have the exact same DNA sequence and yet look different and perform different functions?

   • Answer: The proteins are expressed differently in each cell
     • Different cells express different sets of genes, leading to distinct functions and appearances despite having the same DNA.

5. What step did Stella miss in her explanation?

   • Answer: mRNA is translated into amino acids.
     • Stella missed the crucial step where the mRNA is translated into a sequence of amino acids during protein synthesis.

If you have any more questions or need further clarification, feel free to ask!